Catalog of Electrical Engineering questions with useful answers that help you develop a clear insight of your conceptual problems.
List of topics:
The CT’s secondary winding should never be open-circuited! Since, Open-circuiting a CT’s secondary winding may result in a dangerous amount of voltage developing between the secondary terminals because the CT will attempt todrive a substantial current through a very high resistance. This is why you will never see fuses in the secondary circuit of a … Read more
A PT’s secondary winding should never be short-circuited, since Short-circuiting a PT’s secondary winding may result in a dangerous amount of current developing in the circuit because the PT will attempt to maintain a substantial voltage across a very low resistance. Also see: Why CT secondary winding should never be open-circuited While the recommendation to … Read more
Letters A, B, C, and F on Potentiometers indicate relationship between slider position and resistance of potentiometer. The relationship between slider position and resistance is also sometimes known as the “taper” or “law”. This relationship can be controlled during manufacture by changing the composition or thickness of the resistance coating along the resistance element. Potentiometers … Read more
Electrical Engineering XYZ Question on Why silver is not used in overhead transmission lines. Answer: Silver is an excellent conductor of electricity, even better than copper. However, there are several reasons and certain limitations because of which silver is not widely used for this purpose. While cost is the major and primary reason for that, … Read more
The value of string efficiency depends upon the value of K. Where K is defined as the ratio of shunt capacitance to mutual capacitance. The lesser the value of K is, the greater is the string efficiency and more uniform is the voltage distribution. K can be decreased by reducing the shunt capacitance. In order … Read more
The impact of lightning strike on transmission lines is to create a surge that runs across the line. In most cases, such surge can cause line insulators to flashover and can cause damage to nearby generators, transformers or other equipment connected to line in case of absence of proper protection system. Also see: Electrical Safety … Read more
The temperature coefficient of resistance (TCR) is a measure of how much an electrical resistance of material changes with temperature. The temperature coefficient can be positive, negative, or zero. A negative temperature coefficient of resistance (NTC) means that the resistance of the material decreases as the temperature increases. In other words, as the temperature rises, … Read more
One of very common Electrical Engineering safety related questions in about volts. In this article Electrical Engineering XYZ shares how many volts are dangerous volts for humans. In industry, 30 volts is generally considered to be a conservative threshold value for dangerous voltage. The cautious person should regard any voltage above 30 volts as threatening, … Read more
If Direct current (DC) voltage is provided to string of suspension insulators, then voltage across all units will remain same. This happens because insulator capacitance is ineffective in case of DC. As a result string efficiency of DC system is 100%. More Electrical Engineering Questions:
A synchronous motor can fail to start for a variety of reasons. Given below are few of them: So that was all about the possible reasons of a synchronous motors failure to start. Also see: